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90=6d+4d
We move all terms to the left:
90-(6d+4d)=0
We add all the numbers together, and all the variables
-(+10d)+90=0
We get rid of parentheses
-10d+90=0
We move all terms containing d to the left, all other terms to the right
-10d=-90
d=-90/-10
d=+9
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